CN207560346U - A kind of motor sub-assembly - Google Patents
A kind of motor sub-assembly Download PDFInfo
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- CN207560346U CN207560346U CN201721263726.XU CN201721263726U CN207560346U CN 207560346 U CN207560346 U CN 207560346U CN 201721263726 U CN201721263726 U CN 201721263726U CN 207560346 U CN207560346 U CN 207560346U
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- yoke
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- magnet
- material strip
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Abstract
The utility model embodiment is related to dynamic iron design field, discloses a kind of motor sub-assembly, including：Material strip；Multiple first yokes, each first yoke are all connected to material strip；Multiple first magnet, wherein, first magnet is welded in first yoke, wherein, and one first magnet and first yoke form a yoke magnetic assembly.By the above-mentioned means, the utility model embodiment can realize automatic assembling, produce motor in enormous quantities, improve the yield of motor.
Description
Technical field
The utility model embodiment is related to dynamic iron design field, more particularly to a kind of motor sub-assembly.
Background technology
Dynamic iron unit is widely used in the fields such as dynamic iron earphone, hearing aid.And in dynamic iron unit, motor be one very
Important component, it is equivalent to the engine of dynamic iron unit, in traditional motor packaging technology, side mainly manually
Magnet and yoke are fixed on sheet by method, by the consistency that the Assurance of Size of sheet assembles, by dispensing UV stoves or
Person's baking oven is by glue curing, so as to make together with magnet and yoke fixed Combination.
Inventor in the process of implementing the utility model, it is found that the relevant technologies have the following problems:Due to the body of motor
It accumulates very, and the volume smaller of the component in motor, in man-made assembly motor, it is difficult to which the component to motor positions, hold
It easily causes assembling and deviation occurs, influence the yield of motor.
Utility model content
In order to solve the above-mentioned technical problem, the utility model embodiment provides a kind of motor sub-assembly, can improve manufacture horse
The yield reached.
In order to solve the above-mentioned technical problem, the utility model embodiment provides following technical scheme：
In a first aspect, the utility model embodiment provides a kind of preparation method of motor, including：
Yoke component is manufactured, the yoke component includes material strip and multiple first yokes, and each first yoke connects
It is connected to material strip；
One first magnet, and one first magnet and the first yoke group are welded on first yoke
Into a yoke magnetic assembly, all yoke magnetic assemblies form the first motor sub-assembly with the material strip；
The second motor sub-assembly is made, second motor sub-assembly includes first motor sub-assembly and multiple skeletons, an institute
It states skeleton and a yoke magnetic assembly is integrally formed；
Manufacture third motor sub-assembly；The third motor sub-assembly includes the second magnet, the second yoke and the second motor sub-assembly；
In each skeleton over-assemble coil of the third motor sub-assembly, and the material strip is cut, form motor.
Optionally, the manufacture yoke material strip includes：
Band-like blank is fixed by fixture, wherein, the band-like blank includes multiple blank units, each hair
Base unit includes the Ministry of worker to be added and clamping portion, and the clamping portion of the two neighboring blank unit is connected to form material strip；
Punching press is carried out to the Ministry of worker to be added of each blank unit, so that the Ministry of worker to be added forms the first yoke,
In, the shape of first yoke is U-shaped.
Optionally, the method further includes：
The junction of the Ministry of worker to be added and clamping portion to each blank unit carries out prejudging processing.
Optionally, the method further includes：
Welding manner is laser welding between first yoke and the first magnet.
Optionally, the second motor sub-assembly of the manufacture includes：
The material strip is positioned, and a yoke magnetic assembly is fixed in one first mold, and to each described
First mold injected plastic raw rubber；
Plastics raw rubber in each first mold is cooled down, so that the plastics raw rubber in each first mold forms bone
Frame, and first motor sub-assembly is integrally molded so as the second motor sub-assembly with the skeleton.
Second aspect, the utility model embodiment also provide a kind of motor sub-assembly, including：
Material strip；
Multiple first yokes, each first yoke are all connected to material strip；
Multiple first magnet, wherein, first magnet is welded in first yoke, wherein, and described one
First magnet and first yoke form a yoke magnetic assembly.
Optionally, the material strip is sequentially connected by multiple clamping portions and formed.
Optionally, the clamping portion includes connecting portion and positioning region；
One end of the connecting portion and one end of positioning region are fixed, and the other end is fixed with first yoke.
Optionally, the positioning region is provided with location hole；The location hole includes：First positioning hole and the second location hole.
Optionally, the other end protrusion of the positioning region has convex block.
Optionally, first yoke includes：The yoke main body, the first yoke arm and the second yoke arm.
At this in new embodiment, motor sub-assembly includes material strip, multiple first yokes and multiple first magnet, and one first
Magnet is welded in first yoke, and every one first yoke is all connected to material strip, due to the first yoke binder band,
The first yoke can be positioned by material strip and then form motor in the other elements of the motor sub-assembly over-assemble, due to
Material strip is to be connected to the first yoke, is not some for belonging to the first yoke, carries out positioning material band by material strip, neither influences
The assembling of motor, and be conducive to be accurately positioned the first yoke, it avoids positioning inaccurate, assembling is caused deviation occur, improve
The yield of motor sub-assembly.Further, be conducive to improve the first yoke using laser welding between the first yoke and the first magnet
The fixed fastness between the first magnet.
Description of the drawings
One or more embodiments are illustrated by corresponding attached drawing, these exemplary illustrations not structure
The restriction of pairs of embodiment, the element for having same reference numbers label in attached drawing is expressed as similar element, unless there are special
It declares, composition does not limit the figure in attached drawing.
Fig. 1 is a kind of overall schematic for receiver that the utility model embodiment provides；
Fig. 2 is a kind of structure diagram for receiver that the utility model embodiment provides；
Fig. 3 is a kind of flow diagram of the manufacturing method for motor that the utility model embodiment provides；
Fig. 4 is a kind of structure diagram for first motor sub-assembly that the utility model embodiment provides；
Fig. 5 is a kind of structure diagram for second motor sub-assembly that the utility model embodiment provides；
Fig. 6 is a kind of structure diagram for third motor sub-assembly that the utility model embodiment provides；
Fig. 7 is a kind of clamping portion and the structure diagram of one first yoke that the utility model embodiment provides；
Fig. 8 is a kind of schematic diagram for first magnet that the utility model embodiment provides；
Fig. 9 is a kind of schematic diagram for first yoke that the utility model embodiment provides.
100 be receiver, and 10 be dynamic iron unit, and 20 be vibrating diaphragm component, and 30 be connecting rod, and 40 be shell, and 50 be material strip, 51
It is clamping portion for yoke magnetic assembly, 52,511 be the first magnet, and 512 be the first yoke, and 5121 be yoke main body, and 5122 be the first yoke
Jib, 5123 be the second yoke arm, and 53 be skeleton, and 521 be connecting portion, and 522 be positioning region, and 5221 be first positioning hole, 5222
It is convex block for the second location hole, 5223.
Specific embodiment
For the ease of understanding the utility model, with reference to the accompanying drawings and detailed description, the utility model is carried out more
Detailed description.It should be noted that when element is expressed " being fixed on " another element, it can be directly in another element
Above or therebetween there may be one or more elements placed in the middle.When an element is expressed " connection " another element, it can
To be directly to another element or there may be one or more elements placed in the middle therebetween.This specification is used
Term " vertical ", " horizontal ", "left", "right" and similar statement for illustrative purposes only.
Unless otherwise defined, the skill of technical and scientific term all used in this specification with belonging to the utility model
The normally understood meaning of technical staff in art field is identical.In the art used in the description of the utility model in this specification
Language is intended merely to the purpose of description specific embodiment, is not intended to limitation the utility model.Art used in this specification
Language "and/or" includes the arbitrary and all combination of one or more relevant Listed Items.
Please refer to Fig.1 and Fig. 2, Fig. 1 be the utility model embodiment provide a kind of receiver overall schematic, Fig. 2
It is a kind of structure diagram for receiver that the utility model embodiment provides, one kind that the utility model embodiment provides is called
Device 100, including：Dynamic iron unit 10, vibrating diaphragm component 20, connecting rod 30 and shell 40, dynamic iron unit 10, vibrating diaphragm component 20 and company
Extension bar 30 may be contained in shell 40, wherein, one end of connecting rod 30 is connect with dynamic iron unit 10, and the other end and vibrating diaphragm group
Part 20 connects, and dynamic iron unit 10 drives vibrating diaphragm component 20 to vibrate by connecting rod 30, and the vibration of vibrating diaphragm component 20 makes a sound, so as to
Realize that receiver 100 pronounces.
In order to improve the yield for manufacturing motor in above-mentioned dynamic iron unit 10, it is above-mentioned that the utility model provides a kind of generation again
The method of motor,
Referring to Fig. 3, Fig. 3 is a kind of flow diagram of the preparation method for motor that the utility model embodiment provides,
Including：
Step S31：Manufacture yoke component, the yoke component include material strip and multiple first yokes, each described first
Yoke is all connected to material strip.
In some embodiments, manufacture yoke component includes：Band-like blank is fixed on assembly line by fixture,
In, the band-like blank includes multiple blank units, and each blank unit includes the Ministry of worker to be added and clamping portion, adjacent
The clamping portion of two blank units is connected to form material strip；Assembly line transports band-like blank to stamping station, in punching press
Punching press is carried out to the Ministry of worker to be added of each blank unit by decompressor on station, so that the Ministry of worker to be added forms first
Yoke, wherein, the shape of first yoke is U-shaped.Since the first yoke is by the Ministry of worker to be added in band-like blank
It is stamped and formed out, and band-like blank includes multiple blank units, each blank unit includes a Ministry of worker to be added, therefore,
When the Ministry of worker to be added of band-like blank carries out punching press, band-like blank can be unfolded to and be laid on multiple punchings of decompressor
Station is pressed, the same time can carry out punching press to multiple Ministry of worker to be added simultaneously by multiple stamping stations of decompressor, so that
Multiple Ministry of worker to be added are formed simultaneously the first yoke, improve the production efficiency of the first yoke.
Further, the Ministry of worker to be added of each blank unit and the junction in clamping portion can also carry out prejudging place
Reason, as：Punching press is carried out to the junction of the processing department and clamping portion by stamping equipment, it is each in the yoke material strip
Pre- fault trough is formed between U-shaped first yoke.
Wherein, the material of first yoke is generally iron-nickel alloy, and nickeliferous ratio is 10~49%, remaining main portion
It is divided into iron, separately there is part trace element, external material need to equally meet the component content proportioning of above-mentioned iron nickel, meanwhile, the material
The magnetic property of first yoke need to be met, therefore its magnetic conductivity is higher, processability, mouldability and weldability are good.It is described more
The shape of a first yoke is U-shaped, and first yoke of the U-shaped structure is produced and processed by mold.Wherein, mold is punching press
Mold, a kind of tool of the stamping die as manufacture product (or half product), design must satisfy technological requirement, finally
Meet the requirement of the shape of U-shaped structure yoke, size and precision.By grasping the classifying of U-shaped structure Sheet Metal Forming Technology, various techniques
The rudimentary knowledge such as calculating, technique formulation, just select the type of mold, carry out mold design, make the type surface matter of mold later
Amount, dimensional accuracy structure and size etc. meet the requirement of technique and product.Wherein, Sheet Metal Forming Technology can be cold punching technology,
Process is roughly divided into two classes：Separation process and molding procedure.The purpose of separation process is by stamping parts and plate in punching course
Material is detached by certain contour line, and separation process is divided into as blanking, punching and shearing etc..The purpose of molding procedure is to make punching
Dabbing embryo generates plastic deformation under conditions of its integrality is not destroyed, and is converted into the required U-shaped structure of product, is molded work
Sequence is divided into as bending, drawing, flange, hole flanging, bulging, reaming etc..Wherein cold punching technology is completed by using cold punching die.
The design of cold punching die must be designed with reference to the surface quality, dimensional accuracy, productivity of yoke U-shaped structure.Wherein, it is multiple
First yoke is mutual indepedent.
Step S32：One first magnet, and one first magnet and one described the are welded on first yoke
One yoke forms a yoke magnetic assembly, and all yoke magnetic assemblies form the first motor sub-assembly with the material strip.
Specifically, the first motor sub-assembly is as shown in Figure 4.Wherein, the specific manufacturing process of the first motor sub-assembly includes：When treating
Processing department is stamped and formed out after the first yoke, and material strip is transported by assembly line to the first welding post, on the first welding post first
By the first assembling device to after the first magnet of every one first yoke fit on, by the first welder by the first magnet and the
One yoke is welded and fixed.
In some embodiments, welding manner is laser welding between first yoke and the first magnet.Wherein laser
Welding is completed by laser, and wherein laser is by optics oscillator and the medium institute group being placed between two end mirror of oscillator hole
Into.When medium is excited to higher-energy state, start to generate same-phase light wave and the roundtrip between two end mirrors, form light
The string knot effect of electricity, light wave is amplified, and obtain enough energy and start to launch laser.
Step S33：The second motor sub-assembly is made, second motor sub-assembly includes first motor sub-assembly and multiple bones
Frame, a skeleton and a yoke magnetic assembly are integrally formed.
Specifically, the second motor sub-assembly is as shown in Figure 5.Wherein, the specific manufacturing process of the second motor sub-assembly includes：When
After one yoke and the welding of the first magnet, material strip is transported by assembly line to injection molding station, is first assembled on injection molding station by mold
Device assembles mold to each yoke magnetic assembly, by injection molding machine to a mold injected plastic raw rubber, treats that plastics raw rubber forms skeleton
Later, each mold is molded, obtains second motor sub-assembly.
In some embodiments, described before the step of mold injected plastic raw rubber, the method further includes：
Each mold is locked by clamping apparatus, clamping apparatus provides clamp force to mold, reduces and is injecting modeling to mold
When expecting raw rubber, there is the risk split in mold.Certainly, due to plastics raw rubber under normal conditions be typically it is solid-state like, to
Before mold injected plastic raw rubber, it is also necessary to plastics raw rubber is heated, so that plastics raw rubber plasticizing becomes molten,
Then the plastics raw rubber of molten is injected in each mold cavity by predetermined pressure.
Step S34：Manufacture third motor sub-assembly；The third motor sub-assembly includes the second magnet, the second yoke and second
Motor sub-assembly.
Specifically, third motor sub-assembly is as shown in Figure 6.And it is specifically included in the manufacturing process of third motor sub-assembly：When
It is formed after skeleton in yoke magnetic assembly, material strip is transported to assembly line to the second welding post, a first yoke on the second welding post
Body component is assembled on a skeleton, wherein, a yoke body component includes one second magnet and one second yoke, wherein, the second magnet
It mutually fixes with the second yoke, then is welded and fixed yoke body component and fixed first yoke of skeleton by the second welder.
In some embodiments, it is fixed by way of laser welding between the second magnet and the second yoke.
Step S35：In each skeleton over-assemble coil of the third motor sub-assembly, and the material strip is cut, shape
Into motor.
Step S35 realizes that process is as follows：After yoke magnetic assembly and the first yoke are welded and fixed, material strip is transported by assembly line
To coiling station, by bobbin winder device on each skeleton wound around coil.In some embodiments, winding method can be single flat
Around the transposition of, double flat around or double flat transposition it is vertical around.After coiling completion, material strip moves to cutter in the drive of assembly line
Position, cuts material strip by cutter device in cutting work station, obtains motor.Wherein, the cutting of the material strip can pass through
The mode that laser technology cuts pre- fault trough is completed, and motor is formed after laser cutting.
It should be noted that：The utility model first stamps out the first yoke, so during motor is manufactured on material strip
It assembles the first magnet, skeleton, yoke magnetic assembly, wound around coil successively afterwards, finally cuts material strip, obtain motor, it follows that material strip
It is used as supporting body, and when after being completed on station in the assembling for completing process, being transported material strip by assembly line
Next station is transported to, carries out the assembling of next station, realizes the automated production of motor.In addition, the shape due to material strip is
Band-like, therefore, material strip can carry the element of multiple motors simultaneously, realize the batch production of motor.
In the utility model embodiment, yoke component is first manufactured when manufacturing motor, wherein, yoke component includes material strip
With multiple first yokes, each first yoke is all connected to material strip, is positioned by material strip, then assemble again skeleton,
Second magnet, the second yoke form motor, wherein, since material strip is connect with the first yoke, material strip is not belonging to the first yoke
Some, therefore, by material strip carry out positioning material band, neither influence motor assembling, and be conducive to the first yoke carry out
It is accurately positioned, avoids positioning inaccurate, assembling is caused deviation occur, improves the yield of motor；In addition, since material strip can be held simultaneously
Multiple first yokes are carried, therefore, when manufacturing motor, assembling skeleton, the second magnet, the can be synchronized on multiple first yokes
Multiple motors that two yokes obtain simultaneously, realize the batch production of motor.Further, it is adopted between the first yoke and the first magnet
With laser welding, be conducive to improve fixed fastness between the first yoke and the first magnet.
Referring to Fig. 4, Fig. 4 is a kind of structure diagram for first motor sub-assembly that the utility model embodiment provides, the
One motor sub-assembly includes multiple yoke magnetic assemblies 51 and material strip 50, and yoke magnetic assembly 51 includes the first magnet 511 and the first yoke 512,
One first magnet 511 is welded on one first yoke 512, and every one first yoke 512 is all connected to material strip 50.In yoke magnetic assembly 51
It is connected to after material strip 50, is spaced a predetermined distance between two neighboring yoke magnetic assembly 51, in some embodiments, two neighboring yoke
The preset distance being spaced between magnetic assembly 51 can be identical.
In some embodiments, the material strip 50 is sequentially connected by multiple clamping portions 52 and formed.The clamping portion 52
For thin-slab structure, including connecting portion 521 and positioning region 522, the clamping portion 52 is connected successively by the one end in the clamping portion 52
Composition material strip 50 is connect, the positioning region 522 is connect with the positioning device of fixture, so that clamping portion 52 is pressed from both sides by the clamping device of fixture
Tightly.(the present embodiment is being not shown in figure)
In some embodiments, the positioning region 522 includes 5221 and second location hole 5222 of first positioning hole, and described the
A positioning hole 5221,5221 and first detent fit of first positioning hole, i.e., described first positioning pin pass through the first positioning
Hole 5221, and the diameter of first positioning pin is identical with the diameter of first positioning hole 5221；Similarly, second positioning pin is worn
The second location hole 5222 is crossed, and the diameter of second positioning pin is identical with the diameter of the second location hole 5222.(the present embodiment exists
It is not shown in figure)
Referring to Fig. 7, above-mentioned clamping portion 52 is connect with one first yoke 512.Specifically, each clamping portion 52 is wrapped
Include connecting portion 521 and positioning region 522, one end of one end and positioning region 522 of connecting portion 521 is fixed, and the other end with it is described
First yoke 512 is fixed, and the positioning region 522 is provided with location hole；The quantity of the location hole is two, and respectively first is fixed
5221 and second location hole 5222 of position hole；The other end protrusion of the positioning region 522 has convex block 5223.
Referring to Fig. 8, above-mentioned first magnet 511 is rectangular parallelepiped structure, certainly, in further embodiments, the first magnet
511 may be cube structure or other meet the three-dimensional knot that the first magnet 511 is fixed on to first yoke 512
Structure.
Referring to Fig. 9, above-mentioned first yoke 512 includes, yoke main body 5121, the first yoke arm 5122 and the second yoke arm
5123, first yoke 512 includes：Yoke main body 5121, the first yoke arm 5122 and the second yoke arm 5123, described first
Yoke arm 5122 and the second yoke arm 5123 are individually fixed in the both ends of the yoke main body 5121, and the yoke master
The shape that body 5121, the first yoke arm 5122 and the second yoke arm 5123 surround is U-shaped, including a U-type groove,
Described in the distance of the first yoke arm 5122 and the second yoke arm 5123 be more than first magnet 511 length, and
The height of the first yoke arm 5122 is more than twice of height of first magnet 511, and first magnet 511 can be with
It is contained in first yoke 512, and can be fixed on first magnet 511 by way of laser welding described
The yoke main body 5121 of first yoke 512.
In the utility model embodiment, motor sub-assembly includes material strip, multiple first yokes and multiple first magnet, and one the
One magnet is welded in first yoke, and every one first yoke is all connected to material strip, due to the first yoke binder band, because
This, can position the first yoke by material strip and then form motor in the other elements of the motor sub-assembly over-assemble, by
It is to be connected to the first yoke in material strip, is not some for belonging to the first yoke, positioning material band, neither shadow is carried out by material strip
The assembling that bandit reaches, and be conducive to be accurately positioned the first yoke, it avoids positioning inaccurate, assembling is caused deviation occur, is carried
The yield of high motor sub-assembly.Further, be conducive to improve the first yoke using laser welding between the first yoke and the first magnet
Fixed fastness between iron and the first magnet.
It should be noted that the preferable implementation of the utility model is given in the specification and its attached drawing of the utility model
Mode, still, the utility model can be realized by many different forms, however it is not limited to the described implementation of this specification
Mode, these embodiments are not as the additional limitation to the utility model content, the purpose of providing these embodiments is that making
To the understanding more thorough and comprehensive of the disclosure of the utility model.Also, above-mentioned each technical characteristic continues to be combined with each other, and is formed
The various embodiments not being enumerated above are accordingly to be regarded as the range of the utility model specification record；Further, to this field
For those of ordinary skill, it can be improved or converted according to the above description, and all these modifications and variations should all belong to
The protection domain of the appended claims for the utility model.
Claims (10)
1. a kind of motor sub-assembly, which is characterized in that including：
Material strip (50)；
Multiple first yokes (512), each first yoke (512) are all connected to material strip (50)；
Multiple first magnet (511), wherein, first magnet (511) is welded in first yoke (512), wherein,
And one first magnet (511) and first yoke (512) form a yoke magnetic assembly (51).
2. motor sub-assembly according to claim 1, which is characterized in that
The material strip (50) is sequentially connected by multiple clamping portions (52) and formed.
3. motor sub-assembly according to claim 2, which is characterized in that further include, a clamping portion (52) and one first
Yoke (512) connects.
4. motor sub-assembly according to claim 3, which is characterized in that
First yoke (512) includes：The yoke main body (5121), the first yoke arm (5122) and the second yoke arm
(5123)。
5. motor sub-assembly according to claim 2, which is characterized in that
The clamping portion (52) includes connecting portion (521) and positioning region (522).
6. motor sub-assembly according to claim 5, which is characterized in that one end and positioning region of the connecting portion (521)
(522) one end is fixed, and the other end and first yoke (512) are fixed.
7. motor sub-assembly according to claim 5, which is characterized in that
The connecting portion (521) is provided with pre- fault trough, and the positioning region (522) is provided with location hole.
8. motor sub-assembly according to claim 7, which is characterized in that the other end protrusion of the positioning region (522) has convex
Block (5223).
9. motor sub-assembly according to claim 7, which is characterized in that the location hole includes：First positioning hole (5221)
With the second location hole (5222).
10. motor sub-assembly according to claim 9, which is characterized in that the diameter of the first positioning hole (5221) and
One positioning pin is identical, and the diameter of the second location hole (5222) is identical with the diameter of the second positioning pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721263726.XU CN207560346U (en) | 2017-09-28 | 2017-09-28 | A kind of motor sub-assembly |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721263726.XU CN207560346U (en) | 2017-09-28 | 2017-09-28 | A kind of motor sub-assembly |
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| CN207560346U true CN207560346U (en) | 2018-06-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107734442A (en) * | 2017-09-28 | 2018-02-23 | 深圳倍声声学技术有限公司 | The preparation method and motor sub-assembly of a kind of motor |
-
2017
- 2017-09-28 CN CN201721263726.XU patent/CN207560346U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107734442A (en) * | 2017-09-28 | 2018-02-23 | 深圳倍声声学技术有限公司 | The preparation method and motor sub-assembly of a kind of motor |
| CN107734442B (en) * | 2017-09-28 | 2023-12-12 | 深圳市长盈精密技术股份有限公司 | Motor preparation method and motor assembly |
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Effective date of registration: 20210816 Address after: 518000 No.3 Factory, Qiaotou Fuqiao Industrial Zone, Fuyong Town, Bao'an District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN EVERWIN PRECISION TECHNOLOGY Co.,Ltd. Address before: 518000 2nd floor, building 25, Zhiheng Industrial Park, nantouguankou 2nd Road, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN BELLSING ACOUSTIC TECHNOLOGY Co.,Ltd. |
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